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Mozilla Launches Firefox 4 and Delivers a Fast, Sleek and Customizable Browsing Experience to More Than 400 Million Users Worldwide

Mozilla, a global, nonprofit organization dedicated to making the Web better, is proud to release Mozilla Firefox 4, the newest version of the popular, free and open source Web browser. Firefox puts users in control of their Web experience, providing a streamlined user interface, fun new features, a boost in speed and support for modern Web technologies.

Firefox 4 is available to download for Windows, Mac OS X and Linux in more than 80 languages. Firefox 4 will also be available on Android and Maemo devices soon.

Firefox 4 is the fastest Firefox yet. With dramatic speed and performance advancements across the board, Firefox is between two and six times faster than previous releases. Major enhancements to the JavaScript engine make everything from startup time to page load speed to graphics and JavaScript performance screaming fast in Firefox.

The latest version of Firefox introduces a sleek new look that lets Web content take center stage. With features like App Tabs and Panorama, Firefox makes it easier and more efficient to navigate the Web. Firefox delivers industry-leading privacy and security features like Do Not Track and Content Security Policy to give users control over their personal data and protect them online.

Firefox supports modern Web technologies, including HTML5. These technologies are the foundation for building amazing websites and Web applications. Go to Web O’ Wonder and check out the incredible online experiences developers can now create.

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What’s New in Firefox 4:

Fastest Firefox Ever

Performance: Firefox is up to six times faster than the previous release. With improved start-up and page load times, speedy Web app performance and hardware accelerated graphics, Firefox is optimized for rich, interactive websites.

The JavaScript engine incorporates the new JägerMonkey JIT compiler, along with enhancements to the existing TraceMonkey JIT and SpiderMonkey’s interpreter for faster page-load speed and better performance of Web apps and games.

HTML5 support in Firefox includes hardware accelerated, high-definition video (WebM), 3D graphics, offline data storage, professional typography, touchscreen interfaces and the Mozilla Audio API to help create visual experiences for sound and more.

Firefox 4 also improves existing tools like CSS, Canvas and SVG to enable developers to make exciting Web pages.

Firefox provides uninterrupted browsing when there is a crash in the Adobe Flash, Apple QuickTime or Microsoft Silverlight plugins. If one of these plugins crashes or freezes, it won’t affect the rest of Firefox. Simply reload the page to restart the plugin.